Hi Mayuresh,
I had similar problem a year back, I copied the o/p of traceroute & dig and
sent it to the ISP's customer care & in cc zone in-charge and the TRAI
authorities (you'll get TRAI address from their website). It was problem of
the router and local guys were not listening to it.
In 2/3 days those guys changed the router.
Regards,
Dnyanraj